Passive horn integrally formed by using liquid silicone rubber and preparation method thereof

ABSTRACT

A passive horn integrally formed by using liquid silicone rubber, includes a first outer casing, a second outer casing, an inner casing and an iron piece. The first outer casing includes a sealing ring, a folding ring and a vibrating membrane, and the sealing ring, the folding ring and the vibrating membrane are integrally injection molded into the first outer casing. A groove is disposed in the second outer casing, and the first outer casing is disposed in the groove. The back surface of the vibrating membrane is provided with a casing groove, which is sequentially embedded with the inner casing and the iron piece. A preparation method of a passive horn integrally formed by using liquid silicone rubber, under the condition of integrated injection molding, may improve the yield rate, ensure product quality, save assembly time and labor cost, and improve production efficiency.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of Application No. CN 201810426800.8filed in China on May 7, 2018 under 35 U.S.C. § 119, the entire contentsof all of which are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to a horn, in particular, to a passivehorn integrally formed by using liquid silicone rubber and a preparationmethod thereof.

BACKGROUND

At present, the traditional preparation process of passive horns used inthe industry is that the hard rubber shell, the folding ring, the ironpiece and the like of the sound are separately processed, and thensubjected to surface treatment, glue coating, lamination, compaction andthe like.

This multi-step processing method has low production efficiency and lowyield of finished products. The folding ring is thermoformed using athermosetting rubber material, and the scrap cannot be reused, resultingin waste. The volatiles in the surface treatment and adhesive-coatingprocess are prone to environmental pollution, and manual bonding oftencauses the boundary lines to be uneven and affect the appearance of theproduct.

SUMMARY

In order to solve the above problems existing in the prior art, thepresent invention provides a passive horn integrally formed by usingliquid silicone rubber and a preparation method thereof, wherein thesealing ring, the folding ring and the vibrating membrane areinjection-molded into an integral structure by using an integralinjection-molding process, wherein the injection-molding process is easyto implement and the package is stable, having the advantages of simplestructure, good sealing effect, firm structure, perfect appearance, nocombined line, and full automatic production, thereby replacing thetraditional production mode and high production efficiency.

To achieve the above object, the present invention provides thefollowing technical solution.

A passive horn integrally formed by using liquid silicone rubber,includes a first outer casing, a second outer casing, an inner casingand an iron piece; the first outer casing includes a sealing ring, afolding ring and a vibrating membrane, and the sealing ring, the foldingring and the vibrating membrane are integrally injection molded into thefirst outer casing; a groove is disposed in the second outer casing, andthe first outer casing is disposed in the groove; the back surface ofthe vibrating membrane is provided with a casing groove, and the casinggroove is sequentially embedded with the inner casing and the ironpiece.

Further, the cross section of the inner casing is a T-shaped structure,and the cross section of the iron piece is an inverted T-shapedstructure, the T-shaped structure cooperating with the inverted T-shapedstructure.

Further, the iron piece is provided with two positioning holes.

Further, the positioning hole is shaped as a strip hole or a round hole.

The present invention further provides a preparation method of the abovepassive horn integrally. The method includes positioning an iron piecein a mold by means of a positioning hole; injecting a plastic rawmaterial or liquid silicone rubber raw material into the mold whileinjection-molding a first outer casing, a second outer casing andwrapping an inner casing with an iron piece to form an integralstructure, wherein the first outer casing is formed by integrallyinjection-molding with a sealing ring, a folding ring and a vibratingmembrane; and after completing the injection-molding, removing the moldby heating and vulcanization.

Further, the molten plastic raw material or liquid silicone rubber rawmaterial may also be injected into the mold in the form ofencapsulation, the second outer casing is injection-molded first and theinner casing is wrapped with the iron piece, and then the first outercasing is injection-molded, so as to form an integral structure, whereinthe first outer casing is formed by integrally injection-molding withthe sealing ring, the folding ring and the vibrating membrane.

Further the material of the first outer casing is a liquid siliconerubber.

Further, the materials of the second outer casing and the inner casingare all PC materials.

Further, during the removing, the temperature of the injection moldingis about 20 degrees Celsius, and the pressure of the injection moldingis less than 20 MPa.

Based on the above technical solutions, the technical effects obtainedby the present invention are:

(1) In the preparation method of above passive horn integrally formed byusing liquid silicone rubber provided by the present invention, there isno waste of the hard rubber outer casing and the material of the foldingring during the injection molding, which saves the cost and improves theutilization rate of the material without causing environmentalpollution. At the same time, since the sealing ring, the folding ringand the vibrating membrane are injection-molded into an integralstructure by using an integral injection-molding process, theinjection-molding process is easy to implement and the package isstable, so that the structure is simple, the sealing effect is good, thestructure is firm, the appearance is perfect, and there is no bondingline.

(2) In the passive horn integrally formed by using liquid siliconerubber provided by the present invention, under the condition ofintegral injection-molding, the product quality is guaranteed, theassembly time and labor cost are saved, and the production efficiency isimproved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the passive horn integrally formed byusing liquid silicone rubber according to the present invention.

FIG. 2 is a perspective view of the first outer casing according to thepresent invention.

FIG. 3 is an overall view of the passive horn integrally formed by usingliquid silicone rubber according to the present invention.

FIG. 4 is a perspective view of the second outer casing according to thepresent invention.

FIG. 5 is a cross-sectional view of the passive horn integrally formedby using liquid silicone rubber according to the present invention.

FIG. 6 illustrates a preparation method of the above passive hornintegrally according to an exemplary embodiment of the invention.

FIG. 7 illustrates a preparation method of the above passive hornintegrally according to another exemplary embodiment of the invention.

Among those, the reference numerals are as follows:

1 first outer casing

2 second outer casing

3 inner casing

4 iron piece

5 positioning hole

11 sealing ring

12 folding ring

13 vibrating membrane

133 casing groove

22 groove

33 T-shaped structure

DETAILED DESCRIPTION

The present invention will be described more fully hereinafter withreference to the accompanying drawings and specific embodiments.Preferred embodiments of the present invention are given in thedrawings. However, the present invention may be embodied in manydifferent forms and is not limited to the embodiments described herein.Rather, these embodiments are provided so that the disclosure will bemore fully understood.

It should be noted that when an element is referred to as being “fixed”to another element, it can be directly on the other element or acentered element can be present. When an element is considered to be“connected” to another element, it can be directly connected to acentered element can be present simultaneously.

For ease of reading, the terms “upper”, “lower”, “left”, and “right” areused in the drawings to indicate the relative position of the referencebetween the elements, and not to limit the present application.

All technical and scientific terms used herein have the same meaning ascommonly understood by one of ordinary skill in the art to which thisinvention belongs, unless otherwise defined. The term used in thedescription of the present invention is for the purpose of describingspecific embodiments and is not intended to limit the present invention.

Embodiment 1

As shown in FIGS. 1 to 5, a passive horn integrally formed by usingliquid silicone rubber comprises a first outer casing 1, a second outercasing 2, an inner casing 3 and an iron piece 4; the first outer casing1 includes a sealing ring 11, a folding ring 12 and a vibrating membrane13, and the sealing ring 11, the folding ring 12 and the vibratingmembrane 13 are integrally injection molded into the first outer casing1; a groove 22 is disposed in the second outer casing 2, and the firstouter casing 1 is disposed in the groove 22; the back surface of thevibrating membrane 13 is provided with a casing groove 133, and thecasing groove 133 is sequentially embedded with the inner casing 3 andthe iron piece 4.

The cross section of the inner casing 3 is a T-shaped structure 33, andthe cross section of the iron piece 4 is an inverted T-shaped structure,the T-shaped structure cooperating with the inverted T-shaped structure,so that the tightness of the inner casing 3 and the iron piece 4 may beenhanced, and the connection between the two may be ensured to be firmand stable.

The iron piece 4 is provided with two positioning holes 5, and thepositioning hole 5 is shaped as a strip hole or a round hole.

In the present embodiment, the sealing ring, the folding ring and thevibrating membrane are injection-molded into an integral structure byusing an integral injection-molding process, wherein theinjection-molding process is easy to implement and the package isstable, so that the structure is simple, the sealing effect is good, thestructure is firm, the appearance is perfect, and there is no bondingline.

And, under the condition of integral injection-molding, the productquality is guaranteed, the assembly time and labor cost are saved, andthe production efficiency is improved.

Embodiment 2

A preparation method, as illustrated in FIG. 6, of above passive hornintegrally formed by using liquid silicone rubber, includes:

S1, positioning an iron piece in a mold by means of a positioning hole;

S2, injecting a plastic raw material or liquid silicone rubber rawmaterial into the mold while injection-molding a first outer casing, asecond outer casing and wrapping an inner casing with an iron piece toform an integral structure, wherein the first outer casing is formed byintegrally injection-molding with a sealing ring, a folding ring and avibrating membrane;

S3, after completing the injection-molding, removing the mold by heatingand vulcanization.

In the present embodiment, the material of the first outer casing is aliquid silicone rubber belonging to thermosetting rubber, which has thecharacteristics of good weather resistance, wear resistance, goodelasticity and compression deformation resistance of the thermosetrubber, and the good fluidity of the liquid material, may be vulcanizedby heating, and may be injection molded; the materials of the secondouter casing and the inner casing are PC material, which ensures thehigh strength of the passive horn produced, wherein both liquid siliconerubber and PC have good adhesion and may be formed by injection molding.

In the present embodiment, in step S3, the temperature of the injectionmolding is about 20 degrees Celsius, and the pressure of the injectionmolding is less than 20 MPa. The heating vulcanization method may bevulcanized by heating with an electric heating rod or oil temperature.

In the present embodiment, a two-color liquid silicone rubberinjection-molding machine is used to simultaneously injection-mold thefirst outer casing, the second outer casing and the inner casing ironpiece through two sets of two-color injection-molding molds, that is,forming with one-time injection-molding to realize product production.

In the present embodiment, two-color liquid silicone rubberinjection-molding machine is adopted, through two materials (liquidsilicone rubber and PC) injection-molding mold, using two materials(liquid silicone rubber and PC) injection molding equipment combinedwith robot automated production, so as to improve production efficiency,improve the pass rate of finished products, and reduce product costs.

In the present embodiment, there is no waste of the hard rubber outercasing and the material of the folding ring during the injectionmolding, which saves the cost and improves the utilization rate of thematerial without causing environmental pollution. At the same time,since the sealing ring, the folding ring and the vibrating membrane areinjection-molded into an integral structure by using an integralinjection-molding process, the injection-molding process is easy toimplement and the package is stable, so that the structure is simple,the sealing effect is good, the structure is firm, the appearance isperfect, and there is no bonding line.

Embodiment 3

A preparation method, as illustrated in FIG. 7, of above passive hornintegrally formed by using liquid silicone rubber, includes:

S21, positioning an iron piece in a mold by means of a positioning hole;

S22, the molten plastic raw material or liquid silicone rubber rawmaterial is injected into the mold in the form of encapsulation, thesecond outer casing is injection-molded first and the inner casing iswrapped with the iron piece, and then the first outer casing isinjection-molded, to form an integral structure, wherein the first outercasing is formed by integrally injection-molding with the sealing ring,the folding ring and the vibrating membrane.

S23, after completing the injection-molding, removing the mold byheating and vulcanization.

In the present embodiment, the material of the first outer casing is aliquid silicone rubber belonging to thermosetting rubber, which has thecharacteristics of good weather resistance, wear resistance, goodelasticity and compression deformation resistance of the thermosetrubber, and the good fluidity of the liquid material, may be vulcanizedby heating, and may be injection molded; the materials of the secondouter casing and the inner casing are PC material, which ensures thehigh strength of the passive horn produced, wherein both liquid siliconerubber and PC have good adhesion and may be formed by injection molding.

In the present embodiment, in step S3, the temperature of the injectionmolding is about 20 degrees Celsius, and the pressure of the injectionmolding is less than 20 MPa.

In the present embodiment, using a conventional injection-moldingmachine, i.e. a vertical injection-molding machine or horizontalinjection-molding machine, plus a conventional liquid silicone rubberinjection-molding machine, the second outer casing and the inner casingiron piece are injection-molded first in the first set of molds throughthe conventional injection-molding machine workbench, then the secondouter casing and the inner casing iron piece are placed into the secondset of molds to injection-mold the first outer casing to form anintegral structure by using the conventional liquid silicone rubberinjection-molding machine, so that after two sets of molds are placed ontwo different conventional injection-molding machines, the product isproduced by two injection-moldings, and then with combination of roboticautomated production, the production efficiency is improved, the yieldof finished products is improved, and the product cost is reduced.

In the present embodiment, there is no waste of the hard rubber outercasing and the material of the folding ring during the injectionmolding, which saves the cost and improves the utilization rate of thematerial without causing environmental pollution. At the same time,since the sealing ring, the folding ring and the vibrating membrane areinjection-molded into an integral structure by using an integralinjection-molding process, the injection-molding process is easy toimplement and the package is stable, so that the structure is simple,the sealing effect is good, the structure is firm, the appearance isperfect, and there is no bonding line.

The above description is only examples and illustrative of the structureof the present invention, and the description thereof is more specificand detailed, but is not to be construed as limiting the scope of thepresent invention. It should be noted that it will be apparent to thoseskilled in the art that various modifications and improvements can bemade without departing from the spirit and scope of the presentinvention. These obvious alternatives are all within the scope of thepresent invention.

1. A passive horn, comprises: a first outer casing, comprising: asealing ring; a folding ring; and a vibrating membrane including acasing groove formed in a back surface of the vibrating membrane, thesealing ring, the folding ring and the vibrating membrane beingintregally injectin molded, using liquid silicone rubber, into the firstcasing; a second outer casing, having a groove disposed therein; (2), aninner casing (3) and an iron piece, wherein the first outer casing isdisposed in the groove, and wherein the casing groove is sequentiallyembedded with the inner casing and the iron piece.
 2. The passive hornaccording to claim 1, wherein a cross section of the inner casing is aT-shaped structure and a cross section of the iron piece is an invertedT-shaped structure, the T-shaped structure cooperating with the invertedT-shaped structure.
 3. The passive horn according to claim 1, whereinthe iron piece is provided with two positioning holes.
 4. The passivehorn according to claim 3, wherein each positioning hole is shaped as astrip hole or a round hole.
 5. A preparation method of the passive hornaccording to claim 1, the method comprising: positioning the iron piecein a mold by means of a positioning hole; injecting a plastic rawmaterial or liquid silicone rubber raw material into the mold whileinjection-molding the first outer casing, the second outer casing andwrapping the inner casing with the iron piece to form an integralstructure, wherein the first outer casing is formed by integrallyinjection-molding with the sealing ring, the folding ring and thevibrating membrane; and after completing the injection-molding, removingthe mold by heating and vulcanization.
 6. The preparation methodaccording to claim 5, wherein, during said injecting, the molten plasticraw material or liquid silicone rubber raw material is injected into themold in the form of encapsulation, the second outer casing isinjection-molded first and the inner casing is wrapped with an ironpiece, and then the first outer casing is injection-molded, so as toform an integral structure, wherein the first outer casing is formed byintegrally injection-molding with the sealing ring, the folding ring andthe vibrating membrane.
 7. The preparation method according to claim 5,wherein, during said injecting, the material of the first outer casingis a liquid silicone rubber.
 8. The preparation method according toclaim 5, wherein, during said injecting, the materials of the secondouter casing and the inner casing are PC materials.
 9. The preparationmethod wherein, during said injecting according to claim 5, wherein,during said removing, the injection-molding temperature is about 20degrees Celsius, and the injection-molding pressure is less than 20 MPa.